[Performance] Memoize hasGit check

[gonzaloriestra]

WHY are these changes introduced?

The hasGit check runs git --version, which is a shell command. Redundant executions of this check during a single CLI command lifecycle add unnecessary overhead.

WHAT is this pull request doing?

Memoizes the result of hasGit using a module-level promise. This ensures that git --version is executed at most once per process, and concurrent calls return the same promise.

Expected performance impact: Reduces process execution overhead by avoiding redundant git --version calls.

How to test your changes?

CI

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 5396090806031353117 started by @gonzaloriestra

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[github-actions]

Differences in type declarations

We detected differences in the type declarations generated by Typescript for this branch compared to the baseline ('main' branch). Please, review them to ensure they are backward-compatible. Here are some important things to keep in mind:

• Some seemingly private modules might be re-exported through public modules.
• If the branch is behind main you might see odd diffs, rebase main into this branch.

New type declarations

We found no new type declarations in this PR

Existing type declarations

packages/cli-kit/dist/public/node/context/local.d.ts

@@ -132,6 +132,11 @@ export declare function cloudEnvironment(env?: NodeJS.ProcessEnv): {
  * @returns A promise that resolves with the value.
  */
 export declare function hasGit(): Promise<boolean>;
+/**
+ * Resets the memoized value for the hasGit check.
+ * This is only used for testing purposes.
+ */
+export declare function _resetHasGit(): void;
 /**
  * Gets info on the CI platform the CLI is running on, if applicable.
  *